What is URL encoding?

URL encoding (percent-encoding) replaces unsafe ASCII characters with a % followed by two hex digits so they can be safely included in a URL.

When should I URL-encode a string?

Encode strings before appending them as query parameters or path segments to avoid breaking the URL structure.

URL Encoder / Decoder

Percent-encode URLs for safe transmission and decode them back.

v1.0.0Updated Jul 2026

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Where it runs

Your browser

Data retention

None — nothing is uploaded or stored

Maintained by

EasyTechLabs Engineering

How this works & your privacy

🔒 Nothing you paste, type, or drop is uploaded, stored, or logged. All processing happens in your browser and the data never leaves your device — close the tab and it is gone.

Component mode uses encodeURIComponent to percent-encode reserved characters (& ? = / #), which is correct for query-parameter and path-segment values. Full mode uses encodeURI, preserving URL structure for encoding a whole URL. Decoding reverses either mode and flags malformed percent-sequences.

Limitations

Component mode escapes URL-reserved characters; full mode deliberately does not — choose the mode that matches whether you are encoding a value or a whole URL.
A lone '%' or an invalid '%zz' sequence cannot be decoded and is reported as an error.
Percent-encoding operates on UTF-8 bytes, matching modern browsers and the WHATWG URL standard.

Standards & references

Frequently Asked Questions

Plain text

Encoded

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🔒 Component mode escapes reserved characters (& ? = / #). Runs in your browser; nothing is uploaded.